Major Mercer of the Worcestershire horse
Encyclopedia
Major Mercer, the commander of the Worcestershire horse, played a significant part in the Battle of Worcester
Battle of Worcester
The Battle of Worcester took place on 3 September 1651 at Worcester, England and was the final battle of the English Civil War. Oliver Cromwell and the Parliamentarians defeated the Royalist, predominantly Scottish, forces of King Charles II...

 in 1651, but although mentioned in primary sources his full name is not given in them. David Laing
David Laing (Scottish antiquary)
David Laing was a Scottish antiquary.The son of William Laing, a bookseller in Edinburgh, where he was born, he was educated at the Canongate Grammar School. At fourteen he was apprenticed to his father. Shortly after the death of the latter in 1837, Laing was elected to the librarianship of the...

 speculated that he was John Mercer the younger brother of William Mercer
William Mercer (poet)
William Mercer , was a Scottish poet and army officer.-Biography:At fifteen he ran away from school to become a soldier and fought in the 30 Years War. By the...

who was also a parliamentary officer and author of "Angliae Speculum, or England's looking-glass" (London 1646).
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